nua_event_server.c 8.96 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82
/*
 * This file is part of the Sofia-SIP package
 *
 * Copyright (C) 2006 Nokia Corporation.
 *
 * Contact: Pekka Pessi <pekka.pessi@nokia.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

/**@CFILE nua_event_server.c
 * @brief Easy event server
 *
 * @author Pekka Pessi <Pekka.Pessi@nokia.com>
 *
 * @date Created: Wed Mar  8 11:48:49 EET 2006 ppessi
 */

#include "config.h"

#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

#include <assert.h>

#include <sofia-sip/string0.h>

#include <sofia-sip/sip_protos.h>
#include <sofia-sip/sip_status.h>
#include <sofia-sip/su_tagarg.h>

#define NTA_LEG_MAGIC_T      struct nua_handle_s
#define NTA_OUTGOING_MAGIC_T struct nua_handle_s

#define NEA_SMAGIC_T         struct nua_handle_s
#define NEA_EMAGIC_T         struct nua_handle_s

#include "nua_stack.h"

/* ======================================================================== */
/* Event server */

static
nea_event_t *nh_notifier_event(nua_handle_t *nh, 
			       su_home_t *home, 
			       sip_event_t const *event,
			       tagi_t const *tags);

static
void authorize_watcher(nea_server_t *nes,
		       nua_handle_t *nh,
		       nea_event_t *ev,
		       nea_subnode_t *sn,
		       sip_t const *sip);

void
nua_stack_notifier(nua_t *nua, nua_handle_t *nh, nua_event_t e, tagi_t const *tags)
{
  su_home_t home[1] = { SU_HOME_INIT(home) };
  sip_event_t const *event = NULL;
  sip_content_type_t const *ct = NULL;
  sip_payload_t const *pl = NULL;
  url_string_t const *url = NULL;
  char const *event_s = NULL, *ct_s = NULL, *pl_s = NULL;
  nea_event_t *ev;
  int status = 500;
Pekka Pessi's avatar
Pekka Pessi committed
83
  char const *phrase = nua_500_error;
84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108

  nua_stack_init_handle(nua, nh, nh_has_nothing, NULL, TAG_NEXT(tags));

  tl_gets(tags, 
	  NUTAG_URL_REF(url), 
	  SIPTAG_EVENT_REF(event),
	  SIPTAG_EVENT_STR_REF(event_s),
	  SIPTAG_CONTENT_TYPE_STR_REF(ct_s),
	  SIPTAG_PAYLOAD_REF(pl),
	  SIPTAG_PAYLOAD_STR_REF(pl_s),
	  TAG_END());

  if (!event && !event_s)
    status = 400, phrase = "Missing Event";

  else if (!ct && !ct_s) 
    status = 400, phrase = "Missing Content-Type";

  else if (!nh->nh_notifier &&
	   !(nh->nh_notifier = 
	     nea_server_create(nua->nua_nta, nua->nua_root,
			       url->us_url,
			       NH_PGET(nh, max_subscriptions), 
			       NULL, nh,
			       TAG_NEXT(tags)))) 
Pekka Pessi's avatar
Pekka Pessi committed
109
    status = 500, phrase = nua_500_error;
110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349

  else if (!event && !(event = sip_event_make(home, event_s)))
    status = 500, phrase = "Could not create an event header";

  else if (!(ev = nh_notifier_event(nh, home, event, tags)))
    status = 500, phrase = "Could not create an event view";

  else if (nea_server_update(nh->nh_notifier, ev,  TAG_NEXT(tags)) < 0)
    status = 500, phrase = "No content for event";

  else if (nea_server_notify(nh->nh_notifier, ev) < 0)
    status = 500, phrase = "Error when notifying watchers";
  else 
    nua_stack_event(nua, nh, NULL, e, status = SIP_200_OK, 
		    SIPTAG_EVENT(event),
		    SIPTAG_CONTENT_TYPE(ct),
		    TAG_END());
	     
  if (status != 200)
    nua_stack_event(nua, nh, NULL, e, status, phrase, TAG_END());

  su_home_deinit(home);
}


/* Create a event view for notifier */
static
nea_event_t *nh_notifier_event(nua_handle_t *nh, 
			       su_home_t *home, 
			       sip_event_t const *event,
			       tagi_t const *tags)
{
  nea_event_t *ev = nea_event_get(nh->nh_notifier, event->o_type);
  sip_accept_t const *accept = NULL;
  char const  *accept_s = NULL;
  sip_content_type_t const *ct = NULL;
  char const *ct_s = NULL;

  if (ev == NULL) {
    char *o_type = su_strdup(home, event->o_type);
    char *o_subtype = strchr(o_type, '.');

    if (o_subtype)
      *o_subtype++ = '\0';

    tl_gets(tags, 
	    SIPTAG_ACCEPT_REF(accept),
	    SIPTAG_ACCEPT_STR_REF(accept_s),
	    SIPTAG_CONTENT_TYPE_REF(ct),
	    SIPTAG_CONTENT_TYPE_STR_REF(ct_s),
	    TAG_END());
      
    /*
     * XXX - We really should build accept header when we add new content
     * types
     */
    if (accept_s == NULL && accept)
      accept_s = sip_header_as_string(home, (sip_header_t *)accept);
    if (accept_s == NULL && ct)
      accept_s = ct->c_type;
    if (accept_s == NULL && ct_s)
      accept_s = ct_s;

    ev = nea_event_create(nh->nh_notifier, 
			  authorize_watcher, nh,
			  o_type, o_subtype,
			  ct ? ct->c_type : ct_s,
			  accept_s);
  }

  return ev;
}

/* Callback from nea_server asking nua to authorize subscription */
static
void authorize_watcher(nea_server_t *nes,
		       nua_handle_t *nh,
		       nea_event_t *ev,
		       nea_subnode_t *sn,
		       sip_t const *sip)
{
  nua_t *nua = nh->nh_nua;
  msg_t *msg = NULL;
  nta_incoming_t *irq = NULL;
  int substate = sn->sn_state;
  int status; char const *phrase;

  SET_STATUS1(SIP_200_OK);

  /* OK. In nhp (nua_handle_preferences_t) structure we have the
     current default action (or state) for incoming
     subscriptions. 
     Action can now be modified by the application with NUTAG_SUBSTATE(). 
  */
  irq = nea_sub_get_request(sn->sn_subscriber);
  msg = nta_incoming_getrequest(irq);

  if (sn->sn_state == nea_embryonic) {
    char const *what;

    substate = NH_PGET(nh, substate);

    if (substate == nua_substate_embryonic)
      substate = nua_substate_pending;

    if (substate == nua_substate_terminated) {
      what = "rejected"; SET_STATUS1(SIP_403_FORBIDDEN);
    }
    else if (substate == nua_substate_pending) {
      what = "pending"; SET_STATUS1(SIP_202_ACCEPTED);
    }
    else {
      what = "active";
    }

    SU_DEBUG_7(("nua(%p): authorize_watcher: %s\n", nh, what)); 
    nea_sub_auth(sn->sn_subscriber, substate,
		 TAG_IF(substate == nua_substate_pending,
			NEATAG_FAKE(1)),
		 TAG_IF(substate == nua_substate_terminated,
			NEATAG_REASON("rejected")),
		 TAG_END());
  }
  else if (sn->sn_state == nea_terminated || sn->sn_expires == 0) {
    substate = nua_substate_terminated;
    nea_server_flush(nes, NULL);
    SU_DEBUG_7(("nua(%p): authorize_watcher: %s\n", 
		nh, "watcher is removed")); 
  }

  nua_stack_event(nua, nh, msg, nua_i_subscription, status, phrase,
	   NUTAG_SUBSTATE(substate),
	   NEATAG_SUB(sn->sn_subscriber),
	   TAG_END());
}

/* ---------------------------------------------------------------------- */
/* Authorization by application */

void
nua_stack_authorize(nua_t *nua, nua_handle_t *nh, nua_event_t e, 
	     tagi_t const *tags)
{
  nea_sub_t *sub = NULL;
  nea_state_t state = nea_extended;

  tl_gets(tags,
	  NEATAG_SUB_REF(sub),
	  NUTAG_SUBSTATE_REF(state),
	  TAG_END());

  if (sub && state > 0) {
    nea_sub_auth(sub, state, TAG_NEXT(tags));
    nua_stack_event(nua, nh, NULL, e, SIP_200_OK, TAG_END());
  }
  else {
    nua_stack_event(nua, nh, NULL, e, SIP_500_INTERNAL_SERVER_ERROR, TAG_END());
  }
  return;
}




/** Shutdown notifier object */
int
nh_notifier_shutdown(nua_handle_t *nh, nea_event_t *ev,
		     tag_type_t t, tag_value_t v, ...)
{
  nea_server_t *nes = nh->nh_notifier;
  nea_subnode_t const **subs;
  int busy = 0;

  if (nes == NULL)
    return 0;

  subs = nea_server_get_subscribers(nes, ev);

  if (subs) {
    int i;
    ta_list ta;

    ta_start(ta, t, v);
    
    for (i = 0; subs[i]; i++)
      nea_sub_auth(subs[i]->sn_subscriber, nea_terminated, ta_tags(ta));
    
    ta_end(ta);

    busy++;
  }

  nea_server_free_subscribers(nes, subs);
  
  nea_server_flush(nh->nh_notifier, NULL);

  if (ev == NULL)
    nea_server_destroy(nh->nh_notifier), nh->nh_notifier = NULL;

  return busy;
}


/** Terminate notifier. */
void
nua_stack_terminate(nua_t *nua, nua_handle_t *nh, nua_event_t e, tagi_t const *tags)
{
  sip_event_t const *event = NULL;
  sip_content_type_t const *ct = NULL;
  sip_payload_t const *pl = NULL;
  char const *event_s = NULL, *ct_s = NULL, *pl_s = NULL;
  nea_event_t *nev = NULL;

  if (nh->nh_notifier == NULL) {
    UA_EVENT2(e, 500, "No event server to terminate");
    return;
  }

  tl_gets(tags, 
	  SIPTAG_EVENT_REF(event),
	  SIPTAG_EVENT_STR_REF(event_s),
	  SIPTAG_CONTENT_TYPE_REF(ct),
	  SIPTAG_CONTENT_TYPE_STR_REF(ct_s),
	  SIPTAG_PAYLOAD_REF(pl),
	  SIPTAG_PAYLOAD_STR_REF(pl_s),
	  TAG_END());

  nev = nea_event_get(nh->nh_notifier, 
		      event ? event->o_type : event_s);

  if (nev && (pl || pl_s) && (ct || ct_s)) {
    nea_server_update(nh->nh_notifier, nev, TAG_NEXT(tags));
  }

  nh_notifier_shutdown(nh, NULL, 
		       NEATAG_REASON("noresource"), 
		       TAG_NEXT(tags));

  nua_stack_event(nua, nh, NULL, e, SIP_200_OK, TAG_END());
}